david michio goes on a journey to places where time becomes very strange. inside atoms, time blurs to such an extent that something can be in two places at once. within extreme places in space, like black holes, time is squeezed to such an extent that, to an observer, it seems to stand still. time is more variable that it could ever have been thought possible. it can even, theoretically, move backwards. this leads to one of the most extraordinary possibilities - a time machine. this episode shows a graphical representation of what it might look like: the size of a planet and consuming unimaginable amounts of energy but still a possibility